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`E = \frac{h c}{\lambda}`

Enter a value for all fields

The **Photon Energy from Wavelength** calculator compute the energy of a photon based on Planck's constant (h), the speed of light (c) and the wavelength of the photon ( λ).

**INSTRUCTIONS**: Choose units and enter the following:

- (
**λ**) This is the wavelength of the photon

**Energy of Photon (E):** The calculator returns the energy in Joules. However, this can be automatically converted to compatible units via the pull-down menu.

The energy of a photon depends only on its wavelength. The formula for the energy of a photon is:

where:

- E = energy of the photon
- h = Planck's constant
- c = speed of light ( 2.998 × 10
^{8}m/s) - λ= wavelength of the light

Note the following relations are also true:

where:

- E = energy of light
- f = frequency
- h = Planck's Constant
- c = Speed of Light in a vacuum

- Kinetic Energy (change of velocity) : K = ½⋅m⋅(V
_{1}-V_{2})² - Kinetic Energy: KE= ½⋅m⋅v²
- Relativistic Kinetic Energy
- Quantum Energy
- Potential Energy
- Potential Energy of Gravity (two bodies)
- Nuclear Binding Energy: E = m⋅c
^{2} - Energy of a Particle in a Box
- Planck's Equation: E = h⋅f
- Molecular Kinetic Energy
- Electrostatic Potential Energy
- Photon Energy from Wavelength

The **Astronomy Calculator Suite** includes functions that are useful for studying astronomy and include the following:

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
*Small Angle Formula**α = S / D* - Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
**Mass from Luminosity****Mass from Acceleration and Radius****Mass from Speed and Separation****Mass of extra-solar planet from mass of star, radius of star orbit and radius of exoplanet orbit****Mass of extra-solar planet from mass and velocity of star and velocity of planet****Black Hole Mass Calculator****Black Hole Event Horizon Calculator**

- Relative Size Formulas
- Wavelength Formulas
- Other Formulas
**Distance from absolute and apparent magnitude****Radius from Speed and Period****Speed of Circular Motion****Hubble Time****Galaxy Recession Velocity****Luminosity from Mass****Hubble's Law****Exoplanet Calculator****Orbital Radial Acceleration****Distance to Barycenter****Sakuma-Hattori Equation****Astronomical Distance Calculator**provides the distance from the Earth to numerous astronomical bodies (e.g. Sun, Moon, planets, stars, Milky Way's Center and Edge, Andromeda Galaxy)**Astronomical Distance Travel Time Calculator**computes the time to travel to distant parts of space at different velocities.**3D Vector Calculator****Drake Equation Calculator****Seager Equation Calculator****Friedman Equation Calculator****Lagrange Points L1 and L2****Schwarzschild Radius****Hill Sphere Radius****Escape Velocity**